Bag



9 2 A... 7.. 9 A .l

.June 10 1924.

-J. V. CHRIPAR BAG Filed Oct. 18 1922 OUTSIQE x gd/wnr Jlsfaph U. Charlpw useful Improvement in Bags, o-f which the` Patented .lune l0, 1924.

y* srr r ENT orFlfcE.

JOSEPII V. CHARKIPAR, OF CHICAGO, ILLINOIS.

BAG.

Application filed october is, 1922. seriar No'. 595,280.4

following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to coal bags.

These are employed rather extensively and in large numbers for delivering coal, where the bin for receiving kthe coal is so situated that a coal wagon cannot be driven to a position where the coal ycan be discharged into the bin through a chute. The bags are ordinarily made of a very heavy grade of duck or canvas, with a seamless bottom and two seams running -up the sides. In service, the` seams give way long before the body of the fabric is worn out, and materially diminish the life of the bag.

In the accompanying drawing:

Fig. 1 is a side elevation of a partly completed bag according to kmy invention, the shape when completed being shown in dotted lines;

Fig. 2 is a sectional detail of the seam I employ, on line 2-2 of Figure 1;

Fig. 3 is ak similar section of the corresponding seam as heretofore employed.

The bag is formed as a single piece of material 10, doubled centrally to form a seamless bottom, with the edges united at 12 to close the sides of the bag. The seam at 12 is continued below the bottom line at 14, and the corner flap 1 6 turned up to dotted line position 16 and fastened in place by rivets 18 to complete the bag. Stout strips of canvas 20 are preferably provided for handles. The foregoing features of construction, are old in the art, and per se form no part of my present invention.

The width of material employed is usur ally twice the depth of the bag plus the width of the bottom, so that the selvedge, or nished edge of the fabric is at the top of the bag. When the material is cut in this way, the raw edges united to form seam 12 are preferably first hemmed as at 22 in Fig. 3 and the overlapping edges are then stitched again at 24 to form the seam. Rivets 26 are put in at intervals to reinforce and strengthen the seam.

These bags are lilled byplacing them un# der a chute in the coal yard, from which the.` coal is poured to fill them.` Withv aseain` formed as shown in Figure 3,`bothrows ofi stitching 24 are exposed to the severe 'abrae sive action of the fine particles Vof coal fall` ing from the chute, and grinding together" as `thebagris picked up and set down againrv in transportation. Thisy soon .cutsl the stitches at 26 and 28. Cutting stitches at 28 would not necesi sarily put an end to theV usefulness of thev bag, as rivet 25 still keeps the seam froni falling open, but cutting stitches at 26 opens the inner edge of the'sea'm, so that iine'par-V ticles of coal enter at point 30 andV soonv stui the seam into a more or less sausage` bag is now useless.

According to my invention I providev spev cial protection meansi to prevent the effect of cutting the stitches at point 26. The foregoing analysis of the problem will render it more or less apparent, that if this can be accomplished, cutting at point 28 will do relatively little damage, as the rivets and the other seams will continue to hold the parts together, and provide a complete seal, even if the stitches at 28 are completely cut and withdrawn. However, with the seam protected from stuiiing at point 30, the outer row of stitches is not strained unduly, and will last considerably longer on that account.

Referring now to Fig. 2, I hem the outer edge 32 as at 34 in the usual way. The inner edge is laid on the outer without hemming, and stitched at 36, the body of the fabric lying in the dotted line position 38. Stitches 36 are continued down to the bottom of the bag, and across the seam as at 40. The body of fabric at 38 is now laid over into position at 42 and stitches 44 are run down the seam, as close to theedge of the triangular flap 46 as the machine will go. The flap is now turned up into the dotted line position of Figure 1 and the flap and seam riveted as before.

It will be seen that this provides a felled seam for stitches 36, protecting them com- The tension developed bythis y at 28, soon opens the seam entirely at points between rivets 25, so that the sides' of they bag gape ope-n and the coal works out.v kThe pletely from direct access by the coal, and quite effectively also against access of coal particles at point 30.

Bags constructed according to my invention will always serve much longer than those heretofore employed, and in many instances holes will be worn through the b0ttom and various parts of the body of the fabric, before the seam gives way.

It Will be apparent that rivets will carry most of the tension load in either Fig. 2` or Fig. 3, but especiallyin Fig. 2 because the bend in the fabric at will yield almost the thickness of the fabric without putting much tension on stitches 36. In either case, the primary function of the lines of stitches is to seal the edges of the seam, and that of the rivets to carry tension load. Felling the inside edge therefore, helps shift the mechanical load to the fastening means best able to carry it, as well as enormously increasing the protection given to the sealing means.

Without further elaboration, the foregoing will so fully explain the gist of my invention, that others may, by applying current knowledge, readily adapt same for use under various conditions of service, without eliminating certain features which may properly be said to constitute the essential items of novelty involved, which items are intended to be defined and secured by the following claims.

l claim:

1. A bag having a seam comprising overlapping fabric edges, and two spaced lines of stitching uniting said edges to form a seam, one of said lines of stitching holding the edges between which the contents of the bag would first enter in forcing the seam, said edges being positioned to interpose a thickness of fabric between said last mentioned line of stitching and the contents of the bag.

2. A bag having a seam comprising overlapping fabric margins, the edge of the seam inside the bag being felled, a line of stitches holding said felled edge and covered there by, and additional fastening means in said seam for carrying the tension load.

3. A bag having a seam comprising over` lapping fabric margins, the edge of the seam inside the bag being felled, a line of stitches holding said felled edge and covered thereby, and a plurality of additional fastening means in said seam for carrying the tension load.

4. A bag having a seam comprising overlapping fabric margins, rivets centrally located in said margins, the edges of the seam being stitched to seal the same, and the edge inside the bag being felled over the sealing stitches to protect the same.

5. A bag having a seam comprising overlapping fabric edges, metallic fastening means in said seam for carrying the load, and fabric stitches for sealing the edges of said seam, the edge of the seam inside the bag being felled over the stitches to protect .my name this 14th day of October, 1922.

JOSEPH v. CHARIPARQ 

